[闲谈] 聊聊波音737MAX的机械设计问题

not4weak

There's no "ignoring the basic aerodynamic problem of the plane’s 'quick and dirty' engine position/fuselage mismatch," he wrote, and "human factors and the unstable aerodynamics of the 737 MAX have made it inherently unsafe."

我觉得那个飞机的外形设计就有问题，那两个大的引擎放那里就不符合空气动力学原理，然后用软件来纠正鼻子？ 这是犯罪啊

not4weak

给波音发个推特，他们还没理我

not4weak

https://www.boeing.com/commercia ... ftware-updates.page　

读了一下波音的解决方法　－　AGAIN　设计问题。。。

not4weak

波音呢？　为了省钱，采用了MCAS软件的方法，邪恶啊！所假如我测到了抬头，就用软件来纠正？前两次的事故是左右的ANGLEOFATTACK感应器没有交替确认，就迫使机头下压，然后没有经验的飞行员就觉得不对，使劲FIGHT，最后CRASHED了

而且FAA的监管基本上不明白了，说，波音，你自己给自己认证吧。晕死！

So Boeing produced a dynamically unstable airframe, the 737 Max. That is big strike No. 1. Boeing then tried to mask the 737’s dynamic instability with a software system. Big strike No. 2. Finally, the software relied on systems known for their propensity to fail (angle-of-attack indicators) and did not appear to include even rudimentary provisions to cross-check the outputs of the angle-of-attack sensor against other sensors, or even the other angle-of-attack sensor. Big strike No. 3.

not4weak

大家看看比较，这个新的ENGINE比原先大很多，直径增加了一尺。因为变大了，所以必须把它往前挪，否则就会擦地了。　这样的结构，使得飞行员一用力加速，飞机就有自然抬头的倾向。

I’ll say it again: In the 737 Max, the engine nacelles themselves can, at high angles of attack, work as a wing and produce lift. And the lift they produce is well ahead of the wing’s center of lift, meaning the nacelles will cause the 737 Max at a high angle of attack to go to a higher angle of attack. This is aerodynamic malpractice of the worst kind